Comparison

Chum vs OshiDiary

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Chum

Features
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推しとの「あの会話」、もう一度思い出せますか? Chumは、推し活のチェキと“会話”を丸ごと残せるアプリです。撮ったチェキも、特典会で交わした言葉も、ぜんぶここに。 ■ こんな方におすすめ ・推しとの会話を忘れたくない ・チェキの枚数を推しごとに把握したい ・いつ・どこで撮ったか記録を残したい ・推し活の思い出を大切に保存したい ■ できること 【会話を残す】(新機能) 推しとの会話をLINE風に記録。特典会のあの一言を、チェキに紐づけて保存できます。会話は1枚の画像にしてSNSへシェアもOK。 【チェキを記録する】 写真・撮影日・場所・メモを添えてチェキを保存。あなただけのチェキアルバムを作れます。 【推しを管理する】 推しごとにチェキと会話を整理。誰と何枚撮ったか一目でわかります。 【コレクションを振り返る】 日付順・推し別にチェキを一覧表示。大切な思い出をいつでも振り返れます。 ■ 特徴 ・シンプルで直感的な操作 ・チェキや会話などの思い出データはすべて端末内に保存 ・アカウント登録・ログイン不要 ・完全無料 推し活をもっと楽しく、もっと大切に。 Chumで推しとの思い出を、会話ごと残しましょう。

About

OshiDiary

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Have you ever gazed at a stack of Cheki photos, yet struggled to recall what you chatted about with your favourite idol that day? Do you ever wonder how many stages you've shared with your idol over the past year? Snap and upload to build your digital Cheki wall. Track shooting dates and autograph content, reliving those heart-fluttering moments anytime, anywhere. Feeling overwhelmed after a concert? This is your private confessional. Record the day's events and every sweet word your idol whispered to you. Quantify your devotion: ‘Blimey, I've spent that much?’ Automatically tracks your concert attendance and cumulative support expenditure. Watching the numbers grow is proof of your love. Multi-Member Management Support (DD Friendly) Whether you're a dedicated “single-idol supporter” or a broad-minded “box-support/DD”, effortlessly switch between different members' profiles. Create a dedicated page for every shining idol. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Chum4 screens
OshiDiary4 screens

Verdict

The call

The clearest difference is in-app purchases: Chum at none against OshiDiary's 2. OshiDiary's advantage is update cadence (every 2 weeks vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OshiDiary sells 2 in-app purchases, starting at $4.99 per month. Chum asks for nothing beyond the download.

UpkeepUpdate frequency

Chum ships an update monthly, OshiDiary every 2 weeks. The most recent releases landed on September 9, 2026 and September 7, 2026 respectively.

Scorecard2 real differences · 4 level
Chum versus OshiDiary: the parameters behind the verdict, then further details
ParameterChumOshiDiary
PriceFreeFree
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhoneiPhone
Requires iOS18.518.0 — better
Further details — not scored
Size20 MB33 MB
Age rating4+17+
DeveloperKota SakuraiYU FANG

In-app purchases

None

Chum

No in-app purchases

2 purchases

OshiDiary

Subscriptions2
  • Monthly Plan14 Days trial$4.991 Month
  • Annual Plan14 Days trial$19.991 Year

Questions

Is Chum free?
Chum is free to download, with no in-app purchases.
Is OshiDiary free?
OshiDiary is free to download, with in-app purchases available.
Do Chum or OshiDiary have ads?
Neither Chum nor OshiDiary shows ads.
Which is updated more often, Chum or OshiDiary?
Chum ships an update monthly, and OshiDiary every 2 weeks. Most recently, Chum was updated on September 9, 2026 and OshiDiary on September 7, 2026.

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